Method and apparatus for making castings

Abstract From the Canadian patent

A method and apparatus for making metal castings and particularly nodular iron castings. The castings are made in molds, each having a chamber in the upper portions of the mold the chamber being connected by gating passages to the casting cavities. In the manufacture of nodular iron castings a nodu-, larizing agent as placed in the chamber. The chamber is open at the top and the molten metal flows from the chamber into the gating passages of the mold through openings that are disposed above the floor of the chamber. During the pouring operation the upper surface of the mold, including the open top of the chamber, is closed by a refractory sealing member having a passage through which the …